C-PLOT

Contents → Using User Functions → Commands covered → How user functions work

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User functions run as separate processes under the control of C-PLOT and exchange data and other information with the plot program. (See Appendix C for a list of standard user functions.)

You needn't know very much about programming to create your own functions. Prototype C-language files are included with the C-PLOT package, along with the required overhead modules. C-PLOT creates the files, invokes your favorite editor and runs the compiler for you. For ordinary functions you need only type in the lines of C code that describe your calculation. Appendix E contains additional information on writing user functions.


There are five types of user functions. The type number becomes part of the function name. The types are:

Type   Arithmetic   Description   1   y = f(x)   Simple -- You give the range for x.      x = f(t)      2   y = g(t)   Parametric -- You give the range for t.      r = u(t)   (In 3D mode, change r to z.)      s = v(t)         x = f(x, y, r, s)      3   y = g(x, y, r, s)   Operation -- Transforms current data.      r = u(x, y, r, s)   (In 3D mode, change r to z.)      s = v(x, y, r, s)      4      Other -- You supply data (current         data is available).   5      Non-linear fitting -- See Chapter 12.

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